/Engine/Source/Runtime/SlateCore/Public/Application/SlateApplicationBase.h
Given a window, locate a widget under the cursor in it; returns an invalid path if cursor is not over this window.
[FWidgetPath](API\Runtime\SlateCore\Layout\FWidgetPath) LocateWidgetInWindow ( [UE::Slate::FDeprecateVector2DParameter](API\Runtime\SlateCore\Types\FDeprecateVector2DParameter) ScreenspaceMouseCoordinate, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > & Window, bool bIgnoreEnabledStatus, int32 UserIndex ) const